`Async for` can be used to iterate over a websocket's incoming messages

Is your feature request related to a problem? Please describe.

When creating a websocket server I’d like to use async for to iterate over the incoming messages from a connection. This is a feature that the websockets lib uses. Currently, if you try to use async for you get the following error:

TypeError: 'async for' requires an object with __aiter__ method, got WebsocketImplProtocol

Describe the solution you’d like

Ideally, I could run something like the following on a Sanic websocket route:

@app.websocket("/")
async def feed(request, ws):
    async for msg in ws:
        print(f'received: {msg.data}')
        await ws.send(msg.data)

Additional context This was originally discussed on the sanic-support channel on the discord server

[Tronic]

Code clarity should probably take precedence since there really is no speed difference either way 😃

[hyansuper]

I’d like it to have same behavior as the websockets lib